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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74F244DW

Name: SN74F244DW
Brand: Texas Instruments
SKU: SN74F244DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F244DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74F244DW.pdf

Description:: IC BUF NON-INVERT 5.5V 20SOIC

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Product details

Overview

SN74F244DW from Texas Instruments is an octal 3-state noninverting buffer/line driver IC used for memory address driving, bus interfacing, and clock distribution in TTL-based digital systems. It features two independent 4-bit sections with active-low output-enable (OE) inputs, 5 V nominal supply operation, 0°C to 70°C temperature range, and SOIC-20 package. It drives high-capacitance bus lines while maintaining signal integrity in legacy industrial control and data acquisition systems.

For engineers reviewing the SN74F244DW datasheet, SN74F244DW pinout, SN74F244DW application, or SN74F244DW equivalent, key selection criteria include its 3-state output architecture, 64 mA low-level output drive capability, 5.2 ns max propagation delay (A→Y), ±1.6 mA input leakage, and compatibility with standard 5 V TTL logic families in space-constrained PCB layouts.

Technical Context

The SN74F244DW implements dual 4-bit noninverting buffers with symmetrical active-low OE controls per section-1OE enables Y1–Y4, 2OE enables Y5–Y8. Each output enters high-impedance state when its respective OE is high, enabling bidirectional bus arbitration without external logic.

Designed for TTL-compatible voltage thresholds (V_IL = 0.8 V, V_IH = 2.0 V), it operates across 4.5 V–5.5 V supply range with guaranteed 0.55 V max VOL at 64 mA sink current and 2.4 V min VOH at −15 mA source current-ensuring robust noise margins in mixed-signal backplanes and legacy instrumentation interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures stable operation across standard TTL power rail tolerances without regulation overhead.
Propagation Delay (A→Y)	1.7 ns (min) to 6.2 ns (max) at 5 V - Supports reliable timing in 16 MHz–25 MHz address/data strobe paths.
Output Drive (IOL)	64 mA (max) - Sinks sufficient current to drive 10+ standard TTL loads or 50 Ω transmission lines directly.
3-State Enable Delay	tPZL/tPHZ ≤ 8 ns - Enables fast bus turnaround in shared-memory multiprocessor configurations.
Input Leakage (II)	±0.1 mA - Minimizes loading on upstream drivers and preserves fan-out margin in cascaded logic stages.
Operating Temperature	0°C to 70°C - Qualified for commercial-grade embedded systems including test equipment and PLC I/O modules.

Pinout & Package

SN74F244DW uses a 20-pin SOIC (DW) package measuring 13.0 mm × 7.6 mm × 2.65 mm (max height), with 1.27 mm lead pitch and gull-wing leads compatible with standard reflow profiles (MSL Level-1).

Pin/Terminal	Circuit Role	Design Meaning
1 (1OE)	Active-low output enable for Y1–Y4	Drives first 4 outputs into high-Z when logic high; ties directly to microcontroller GPIO or bus controller OE signal.
2–5 (1A1–1A4)	Noninverting inputs for first buffer section	Accept TTL-level address/data bits; no inversion required for direct connection to CPU address bus A0–A3.
6, 19 (GND, VCC)	Power supply reference and supply rail	Requires local 0.1 µF ceramic decoupling near pin 6 and pin 19 to suppress switching noise on shared 5 V rail.
7–10 (1Y1–1Y4)	Noninverting outputs for first buffer section	Drive downstream bus segments; capable of sourcing 15 mA or sinking 64 mA while maintaining TTL VOH/VOL.
11 (2OE)	Active-low output enable for Y5–Y8	Independent control allows staggered enable timing-e.g., enable peripheral address before data in memory-mapped I/O.
12–15 (2A1–2A4)	Noninverting inputs for second buffer section	Route separate signal group (e.g., control/status lines) with isolated enable timing from first section.
16–18, 20 (2Y1–2Y4)	Noninverting outputs for second buffer section	Provide galvanic isolation between bus domains; each output electrically decoupled via 3-state behavior during disable.

Key Features

Feature	Design Value
Dual independent 4-bit sections	Enables split-bus architectures-e.g., separate address and data buffering with independent timing control.
3-State outputs with symmetrical OE	Eliminates need for external bus transceivers; supports bidirectional data flow on shared traces without contention.
High sink current (64 mA)	Drives long parallel buses or multiple TTL inputs without external pull-ups or buffer amplification.
TTL-compatible input thresholds	Interoperates seamlessly with legacy 74LS/74ALS logic, microcontrollers, and FPGA I/O banks configured for 5 V LVTTL.
SOIC-20 footprint	Reduces PCB area by ~40% vs. PDIP-20; supports automated assembly and higher board density in space-limited instruments.

Applications

Memory Address Buffering	Bus Interface Isolation
Use Scenario: Driving 20-bit address bus from microprocessor to multiple memory chips (SRAM, EPROM) in industrial controller. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control synchronizes address latching and prevents bus contention during memory read/write cycles. Use Value: Eliminates timing skew across address lines and sustains signal integrity over 10 cm trace lengths at 16 MHz clock rates.	Use Scenario: Isolating CPU data bus from peripheral expansion slots in modular test equipment. IC Role / Device Role / Timing Role: Dual-section 3-state driver enables hot-plug-safe bus arbitration-peripheral OE signals gate local bus access without CPU intervention. Use Value: Prevents data corruption during card insertion/removal by ensuring high-Z state on all outputs until firmware initializes the slot.
Clock Distribution	Legacy System Interfacing
Use Scenario: Distributing system clock and strobe signals to multiple synchronous peripherals (ADCs, DACs, FIFOs) in data acquisition rack. IC Role / Device Role / Timing Role: Low-skew buffer replicates clock edges with matched tPLH/tPHL to minimize inter-peripheral skew. Use Value: Maintains <500 ps channel-to-channel skew across 8 outputs, meeting setup/hold requirements for 25 MHz sampling clocks.	Use Scenario: Bridging modern microcontroller GPIO (3.3 V tolerant) to legacy 5 V TTL subsystems (e.g., relay drivers, LED displays). IC Role / Device Role / Timing Role: Level-shifting buffer provides voltage translation and drive strength boost without external resistors or level shifters. Use Value: Accepts 3.3 V logic-high inputs safely (VIH = 2.0 V min) and delivers full 5 V TTL swing to downstream devices.

Memory Address Buffering

Bus Interface Isolation

Use Scenario: Driving 20-bit address bus from microprocessor to multiple memory chips (SRAM, EPROM) in industrial controller.

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control synchronizes address latching and prevents bus contention during memory read/write cycles.

Use Value: Eliminates timing skew across address lines and sustains signal integrity over 10 cm trace lengths at 16 MHz clock rates.

Use Scenario: Isolating CPU data bus from peripheral expansion slots in modular test equipment.

IC Role / Device Role / Timing Role: Dual-section 3-state driver enables hot-plug-safe bus arbitration-peripheral OE signals gate local bus access without CPU intervention.

Use Value: Prevents data corruption during card insertion/removal by ensuring high-Z state on all outputs until firmware initializes the slot.

Clock Distribution

Legacy System Interfacing

Use Scenario: Distributing system clock and strobe signals to multiple synchronous peripherals (ADCs, DACs, FIFOs) in data acquisition rack.

IC Role / Device Role / Timing Role: Low-skew buffer replicates clock edges with matched tPLH/tPHL to minimize inter-peripheral skew.

Use Value: Maintains <500 ps channel-to-channel skew across 8 outputs, meeting setup/hold requirements for 25 MHz sampling clocks.

Use Scenario: Bridging modern microcontroller GPIO (3.3 V tolerant) to legacy 5 V TTL subsystems (e.g., relay drivers, LED displays).

IC Role / Device Role / Timing Role: Level-shifting buffer provides voltage translation and drive strength boost without external resistors or level shifters.

Use Value: Accepts 3.3 V logic-high inputs safely (VIH = 2.0 V min) and delivers full 5 V TTL swing to downstream devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74F244N	Same logic function and electrical specs, but in 20-pin PDIP package (13.97 mm width, through-hole mount).	Suitable for prototyping, manual assembly, or legacy through-hole PCBs where SOIC reflow is unavailable.	Select SN74F244N for breadboarding or repair of older equipment; SN74F244DW preferred for automated SMT production.
SN74LS244N	Lower drive (IOL = 24 mA), slower speed (tPD ≈ 15 ns), and reduced ICC (19 mA typical) vs. F-series.	Better suited for low-power, low-speed systems where fan-out > 10 is not required and timing budgets allow ≥15 ns delays.	Choose SN74LS244N only if power consumption is critical and bus capacitance is <30 pF; SN74F244DW maintains performance in high-load environments.

Compared with SN74F244N and SN74LS244N, the SN74F244DW delivers superior speed and drive strength in a compact surface-mount package-making it optimal for high-density, high-speed 5 V TTL bus designs where layout area and signal integrity are prioritized over through-hole serviceability or ultra-low static power.

Availability

SN74F244DW is available at Aetrix Electronics and suitable for memory address buffering, bus interface isolation, and clock distribution requiring stable component supply in commercial-temperature embedded systems.

Supply support for SN74F244DW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.

The SN74F244DW belongs to TI's 74F family of fast TTL logic devices, engineered for high-speed bus driving and memory interfacing in commercial-grade systems where performance, reliability, and pin compatibility with legacy 74xx designs are essential.

FAQ

What is the maximum operating supply voltage for SN74F244DW?

The absolute maximum supply voltage for SN74F244DW is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this range risks violating VIH/VIL thresholds, increasing ICC, and accelerating parametric drift. TI specifies 5 V nominal operation, and all published AC/DC characteristics-including 64 mA IOL and 6.2 ns tPLH-are validated only within the 4.5–5.5 V window.

Does SN74F244DW support hot-swap or live-insertion on a powered bus?

No, SN74F244DW does not support true hot-swap operation. Its absolute maximum ratings permit output voltages up to 5.5 V in disabled state, but simultaneous application of VCC and bus voltage before device power-up may exceed VI limits or cause latch-up. For live-insertion, external series resistors and controlled enable sequencing are required-TI does not characterize or guarantee robustness under partial-power conditions.

Can SN74F244DW drive a 50 Ω transmission line directly?

Yes, SN74F244DW can drive a 50 Ω line terminated at the far end. With 64 mA IOL capability and 0.55 V VOL at that load, it delivers ~2.7 V swing into 50 Ω (V = I × R = 0.064 × 50 = 3.2 V), well within TTL logic-high margin. However, trace impedance matching and edge-rate control remain necessary to prevent reflections-TI confirms functionality but does not specify rise/fall time limits for transmission-line use.

Is SN74F244DW pin-compatible with SN74LS244?

Yes, SN74F244DW and SN74LS244 share identical pinout, function table, and SOIC-20 (DW) or PDIP-20 (N) package options. Both feature dual 4-bit noninverting buffers with active-low OE inputs at pins 1 and 11. However, SN74F244DW offers faster propagation (6.2 ns vs. 15 ns), higher drive (64 mA vs. 24 mA), and greater ICC-so direct substitution requires verification of timing margins and power delivery.

What is the thermal resistance (θ_JA) of SN74F244DW in SOIC package?

Texas Instruments does not publish θ_JA for SN74F244DW in the SDFS063A datasheet. The device predates standardized JEDEC thermal characterization for SOIC packages. Based on TI's generic SOIC-20 (DW) data, θ_JA is approximately 100°C/W on 1-inch² 2-layer board with 2 oz copper; actual value depends heavily on PCB layout, copper area, and airflow. No derating curve is provided-TI specifies only ambient temperature limits (0°C to 70°C).

SN74F244DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74F

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 15mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74F244DW FAQ

1.How can I place an order for SN74F244DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F244DW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74F244DW reliable?

The price and inventory of SN74F244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244DW is usually 5 days.

3.What payment methods are accepted for SN74F244DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F244DW?

SN74F244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F244DW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74F244DW?

For technical support, including SN74F244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244DW requirements.

6.How does Aetrix verify that SN74F244DW is sourced from the original manufacturer or authorized distributors?

All SN74F244DW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74F244DW meets industry standards.

7.What is the process for return or replacement of SN74F244DW?

All SN74F244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244DW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74F244DW part is unused and in its original packaging.

Return procedure for SN74F244DW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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